Thomas Edison① wore many caps during his life. First he was just a poor working boy. He wore working caps of many Kinds. Later in life he became a famous inventor. Then he wore the caps of many famous schools and colleges②. But his most important cap was his thinking cap.

When he was a young boy， Edison's thinking cap saved his mother's life. One night， she suddenly fell ill， a doctor was called in. He had to operate on her at once，but there was not enough light in the room.

Edison quickly put on hid thinking cap. He got all the oil lights in the house and put them on a table.Then he placed a big mirror③ behind them. At once the room became quite bright. The doctor could operate，and his mother was saved.

Edison was a thinking man. Yes， he was a working man and a doing man，too. He was good with his hands and his head. Edison's inventions have changed the world greatly. Today great trains run on electricity④. Electricity lights the streets of towns and villages. Science uses it every day.

Records， shining lights， moving pictures and ringing telephones are very common⑤ now. Edison's thinking cap made them. Usually caps keep the head warm. But \"thinking cap\" keep the world warm. Nots:

①Thomas Edison n．托馬斯·愛迪生

②college n．學(xué)院，大學(xué)

③mirror n．鏡子

④electricity n．電，電學(xué)

⑤common adi．普通的，尋常的